Some meta-directing substituents in aromatic substitution are given. Which one is most deactivat...

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Some meta-directing substituents in aromatic
substitution are given. Which one is most deactivating?
(a) \( -\mathrm{COOH} \)
(b) \( -\mathrm{NO}_{2} \)
(c) \( -\mathrm{C} \equiv \mathrm{N} \)
(d) \( -\mathrm{SO}_{3} \mathrm{H} \)
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